Etymology
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Words related to bon

bonus (n.)
"money or other benefit given as a premium or extra pay to reward or encourage work," 1773, "Stock Exchange Latin" [Weekley], meant as "a good thing," from Latin bonus "good" (adj.), perhaps originally "useful, efficient, working," from Proto-Italic *dw-eno- "good," probably a suffixed form of PIE root *deu- (2) "to do, perform; show favor." The correct noun form would be bonum. Specifically as "extra dividend paid to shareholders from surplus profits" from 1808. In U.S. history the bonus army was tens of thousands of World War I veterans and followers who marched on Washington, D.C., in 1932, at the height of the Great Depression, demanding early redemption of their service bonus certificates (which carried a maximum value of $625).
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bon mot (n.)

"witticism, clever or witty saying," 1735, French, literally "good word," from bon "good" + mot "remark, short speech," literally "word" (12c.), from Vulgar Latin *muttum, from Latin muttire "to mutter, mumble, murmur" (see mutter (v.)). The plural is bons mots.

boon (n.)
late 12c., bone "a petition, a prayer," from Old Norse bon "a petition, prayer," from Proto-Germanic *boniz (source also of Old English ben "prayer, petition," bannan "to summon;" see ban (v.)). The sense gradually passed from "favor asked" to "thing asked for," to "a good thing received, a benefit enjoyed" (1767).
bonhomie (n.)
"frank and simple good nature," 1803, from French bonhomie "good nature, easy temper," from bonhomme "good man" (with unusual loss of -m-), from bon "good" (see bon) + homme "man," from Latin homo "man" (see homunculus). The native equivalent is goodman. Bonhomme "member of an order of begging friars" is from 1620s.
bon soir (interj.)
French, "good evening;" see bon + soiree.
bon voyage 
1670s, French, "pleasant journey," from bon "good," (see bon) + voyage (see voyage (n.)).
bonny (adj.)
"pleasing, good-looking," "a gen. Scottish epithet of appreciation" [OED], but often used ironically, 1540s, of unknown origin; presumably from Old French bon, bone "good" (see bon). Related: Bonnily; bonniness.
bon-vivant (n.)
also bon vivant, "jovial companion, one fond of good living," 1690s, French (see bon); the fem. is bonne vivante.
boon (adj.)
in boon companion "convivial friend, close intimate" (1560s), the only real survival of Middle English boon "good" (early 14c.), from Old French bon (see bon), from Latin bonus "good" (see bonus). Probably influenced by boon (n.).